Apparatus for forming serpentine hollow bodies.



PATENTED JAN. 2, 1906.

K. PARK. APPARATUS POR FORMING SERPENTINE HOLLOW BODIES APPLICATION FILED MAR.20, 1905.

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l I l KENNEDY PARK, OF MANSFIELD, OHIO.

APPARATUS FOR FORMING SERPENTINE HOLLOW BODIES.'

lSpecification of Letters Patent.

Patented Jan. 2, 1906.

Application led March Z0, 1905. Serial No. 250,953.

To all whonc it may concern:

Be it known that I, KENNEDY PARK, of Mansfield, in the county of Richland and State of Ohio, have invented certain new and useful Improvements in Apparatus for Forming Serpentine Hollow Bodies, of which the following is a specification.

This invention relates to the manufacture of serpentine headers which are rectangular in cross-section and fiat on two opposite sides, the other two sides being serpentine. Headers of this class are used in sectional steam-boilers, wherein the serpentine sides are nested together.

The invention has especial relation to the type of apparatus for this purpose shown in Letters Patent of the United States, No. 727,830, granted to me May 12, 1903, the essential features of said apparatus being oscillatory or rotary dies adapted to externally form a serpentine hollow body and a comformable fiowing support for the interior of said body, said support being such asa mass of metal pellets confined in the hollow body.

The present invention consists mainly in the substitution forr the said conformable flowing support of an oscillatory automatically expanding and contracting support for the interior of the hollow body, said support being of an unyielding positively-acting nature and comprising in its preferred embodiment an expansible and contractible'mandrel adapted to occupy the interior of the hollow body between the dies and means for intermittently and positively expanding the material andcausing its sides to follow the undulations of the dies and coperate therej with in forming the serpentine sides of the hollow body.

Of the accompanying drawings, forming a part of this specification, Figure 1 represents a top plan view of an apparatus embodying my invention. Fig. 2 vrepresents a section on line 2 2 of Fig. 1. Fig. 3 represents a section on line 3 3 of Fig. 2. Fig. 4 represents a view similar to Fig. 3 with the parts in different positions. Fig. 5 represents a perspective view of the acting portion of the expansible mandrel. Fig. 6 represents a perspective view of one of the sections of the mandrel. Fig. 7 represents a sectional view of the mandrel. Fig. 8 represents a perspective view of the mandrel expanding and contracting device. Fig. 9 represents a section on line 9 9 of Fig. 3. tion on line 10 10 of Fig. 4. Fig. 11 is a de- Fig. 1() represents a sec-` tail plan view representing a modified construction of the filling-piece hereinafter described.

The same reference characters indicate the same parts in all the figures.

In the drawings, a a represent die-carriers, which are mounted to rotate or oscillate on fixed centers b b. Each die-carrier has a serpentine die-face c, adapted to act progressively in forming serpentine sides 2 2 on the serpentine header 3, said serpentine dies being preferably segmental and occupying portions of the peripheries of the die-carriers. The die-carriers are provided with side dies c3 c3, located at opposite sides of the serpentine dies and formed as flanges projectingoutwardly from the die-carrier and from the dies c. Means are provided for moving the dies c in unison, said means being preferably the same as shown in my former patentnamely, a hydraulic ram the piston h of which is connected by its rod h with a crosshead r,vthe latter being connected by rods y' y' with the die-carriers.

rI`he construction thus far described is or may be the same as the corresponding parts shown in my former patent.

In carrying out my invention I provide as the means for internally supporting the header-blank l a sectional mandrel the acting portion of which is composed of two parts or sections k 7c', which are formed on or affixed to the ends of swinging arms k2 k2, mounted to oscillate upon a common pivot stud or pin k3, afxed to the base of the machine. Each of the sections 7c k has a convex outer face adapted to conform to the concavities of the serpentine dies c. The pivotal connection between the mandrel-sections and the supporting-frame'enables the mandrel as a whole to be oscillated, so that one section can enter a concavity of one of the serpentine dies, while the other section coincides with a convex portion of the opposite die, as shown in Fig.. 4, the arrangement being such that each section of the mandrel coincides alternately with a convex and a concave portion of the adjacent serpentine die c. Means are provided for intermittently and positively expanding the mandrel and permitting its contraction to vary the width of the mandrel and to cause the projection of either section of the mandrel into a concavity of the adjacent serpentine die when the other section is supported by a convex portion of the opposite die. In this embodi- IOO IIO

. VAfilling-piece m, interposed between the two sections of the mandrel and having alternating recesses and projections in its sides, the

said filling-piece being connected by a rod n with the cross-head i. so that it is moved by said cross-head and simultaneously with the dies. The projections and recesses of the iilling-piece are so formed and timed that when one of the sections of the mandrel is supported by a projecting` portion of one of the serpentine dies the other section is forced by the 'filling-piece into the coinciding recess of the opposite die, as shown in Fig. 4. In this figure the section 7c is shown as supported by a projecting portion of one of the dies, while the section c/ is shown as entering a recess in the opposite die. The rotation of the dies in the direction indicated by the arrows in Fig. 4 will next cause the section 7c to be supported by a projection of the adjacent die, while the section 7c enters a recess at the opposite side. It will be seen, therefore, that the mandrel as a whole oscillatcs between the dies and that it is oscillated by the serpentine dies, so that it causes the sides of the blank interposed between the mandrel and the serpentine portions of the dies to assume the curvature provided 'lor by the serpentine dies and the acting faces of the man drel-sections.

It will be seen that the automatically expanding and contracting oscillatory mandrel above described cooperates with the rotary dies in such manner as to impart a serpentine form to opposite sides of the blank 1, the other two sides of the blank being retained in a lat form by the dies c3 c3. The iillingpiece fm may be composed oi sections, (see Fig. 11,) which are provided with ears connected by hinges or pivots r to make the illing-piece flexible, and thus prevent its rear portion from binding` on the inner walls of the blank in case the length of the blank and oi' the lling-piece is such as to involve a swinging movement oi the rear end of the 'filling-piece through an arc of greater length than the distance between the sides of the blank. i

Each of the sections 7c 7c is preferably provided with a tongue kt, which is movable in a recess 765 in the other section, said tongues and recesses being adapted to keep the sections in their proper relative positions.

l. An apparatus of the character stated, comprising rotary or oscillatory dies adapted to externally form a serpentine hollow body, an oscillatory, expansible and contractible support for the interior of said body, and means for intermittently and positively expanding said support.

2. An apparatus of the character stated, comprising rotary or oscillatory dies adapted to externally form a serpentine hollow body, an expansible oscillatory mandrel adapted to occupy the interior of a hollow body between said dies, means for moving the dies in unison, and means for intermittently and positively expanding the mandrel.

3. An apparatus of the character stated, comprising rotary or oscillatory dies adapted to externally 'form a serpentine hollow body, a mandrel composed of separable sections each hinged to a Viixed support, an expanding and contracting device interposed between said sections, and means for moving said device and the dies simultaneously.

4. An apparatus of the character stated, comprising rotary or oscillatory dies adapted to externally 'form a serpentine hollow body, a mandrel composed of separable sections each hinged to a `lixed support, a filling-piece interposed between said sections, said i'illingpiece having alternating projections and recesses, and means for simultaneously moving the dies and filling-piece.

In testimony whereof I have ai'lixed my signature in presence of two witnesses.

KENNEDY PARK. IVitnesses:

C. F. BROWN, E. BATCHELDER. 

